Care about maple (4)
I believe the answer is:
acer
'maple' is the definition.
(I've seen this before)
'care about' is the wordplay.
'about' is an anagram indicator.
'care' is an anagram of 'ACER'.
(Other definitions for acer that I've seen before include "Tree or shrub of the maple genus" , "Plant" , "Type of maple" , "ornamental tree" , "Care about this tree" .)